Pump



Feb. 13, 192s.

I 5 il 2 PUMP..

man ocr. 4. 192o.

2 SHEETS-SHEET l.

y u @s 1l ed@ N gm. iN

l HU

.f Il

u\i I 4 y( @fvwm/1to1 l 2 l v t'ltto'mesd Patented Feb. i3, i923.

sare

AUGUSTNE J'. POCOCK, 0F DAYTON, OHIO; ZADIA POCOCK, ADMINISTRATRIX OFSAID AUGUSTIITE J. POCOCK DECEASED, ASSIGNOR TO THE DAYTON PUMP &`MANUFAC- TUBING COIVPANY, O'JE DAYTON, OHIO, A C(')L'EijORiJl'YN` OFOHIO.

PUMP.

Application filed October 4, `1920.

to provide a pump construction and organiation that permits of easyaccess to the valves and pistons whenever necessary and without thenecessity ot disconnecting either the suction or discharge pipes.

A further object of the invention is to provide a pump which runssmoothly and noiselessly thereby avoiding the usual annoyance common inpumps and which is due to pounding, or hammering as it is more ycommonly termed.

W'ith these objects in view the improvements relate more specifically tothe construction of the water box, and before entering into a detaildescription thereof it may be well to briefly refer to efforts that havebeen put forth to avoid the shocks or hammering annoyance so common. inpumps as heretofore constructed.

Pumps with a single cylinder, whether single acting or double acting,usually produce very much of a shock when passing over centers orrathereachy time the piston changes direction. This condition is causedby the high speed of the piston in one part of its stroke coming to astop at the terminal ot the stroke either way. This has always been anexperienced trouble with a single cylinder' pump and attempts have beenmade to counteract this undesirable feature. The duplex or doublecylinder pump does away with it to a certain extent andthe threecylinder or triplex pump has been and is still being used for theavoidance oi shock. In a word, the water lcolumn in the discharge pipeis made to move more steadily, as two or three cylinders are working,inasmuch as only one of the cylinders is passing over the dead center atanytime, the shock thereby being minimized. y v

In the presentrcase the object ot the present improved water Abox is toproduc-e a steadier flow in the water column or discharge, moreparticularly in a single cylin- Serial No. 414,467.

der pump. T do not confine myself however to a single cylinder inasmuchas the same principle applies to multiple cylinderl pumps. The mainfeatures .which are employed to bring the desired results about,l arefirst; a shock chamber around the outside of the piston barrel and abovethe level oit the inlet or suction valves. All the volume ot thischamber around the outside ofthe said barrel or barrels and above theinlet or suction valves, acts as a pulsation chamber, inasmuch as it maybe partially filled with air which .cannot get out by reason of saidvalves being low down. Therefore. the air in said chamber will becomeraretied or compressed in receiving and steadying the incoming waterthrough the suction orinlet pipe. lt will be noted from theillustrations that from the inletor suction valves the water is directedby curves in the upper portions of the valve plates which serve to throwit without shock towards the cylinder as the piston moves forward. As itreturns, it thrusts the water up the curved top and out through thedischarge valve into the air chamber `and this valve being barelycovered with water and so near, the compressible air in the chamberresponds .very readily to the action of the piston or plunger on thewater, thereby virtually discharging the water into the compressed airin the air chamber, which yresponds to the rush ot' water at the highpoints of the stroke, and then reactson the water passing into thedischarge pipe at the time the piston is on its dead center, thuscompressing and expanding the air with each pulsation of the pump. butkeeping the pressure steady on'the discharge line. Tn a word, absorbingthe differential'between the high speed ot the piston and the stop atthe end of the stroke.

This has been attempted in the various pumps that have air chambers atsome point ron the discharge line, or even in the discharge chamber. Butthe utilization of features peculiar to my invention accomplishes whatIhas heretofore failed of accomplishment.

As a result of the construction which achieves the above ends anotheradvantage of great value is the accessibility to parts subject to mostwear and whereby a person oflittle or no mechanical ability may lookAinto possible trouble without disconnecting pipes .or dismantling thepump,-the simple thing to be done being the removal of the valve plateswhen it will be found that the discharge valve is on the valve plate andreadily gotten at, and the suction valve is standing` out uncovered bythe taking oli of said valve plate. By the removal of the end valveplate the piston can be examined and it necessary7 very readily takenout of the barrel. in inexperienced operator by takinzg` ott what may betermed a nut on the end of' the piston, may readily remove with thehands the piston itselt' with the cup leathers or other packing andfollower7 and can readily replace the leathers it' necessary and screwthe completed piston head back on the rod. This is a very materialimprovement over the common u ay of removing the nut which holds the cupleathers or packing' on the rod, and then having to use 'a *packing hookor some similar instrument to withdraw the leatherusually inspeciallysmall worln a very different operation, and then thereplacement ot the leathers and really building up the piston in thebarrel where it cannot be seen or conveniently gou ten at.

'preceding a more particularly description ot my improvements referenceis now` made to the accompanying,` drawings of which l is a horizontallongitudinal section of a pump containing my improvements5 the samebeing on the line 1-1 of Fig.` 2. Fig. 2 is a vertical lo Y tudinalsection yof the pump on the line 2-2 ot Fig. l. Fig. 3 is a crosssection ot the water box on the line of Land l is an end elevation ofthe water box showing both valve plates and t-he connections of theinlet or suction and discharge pipes.

In a detail description of the improvements in connection with theaccompanying` drawings, similar reference characters indicate similarparts as they appear in said drawings.

T he pump illustrated in the drawings is ot a single cylinder doubleactin type, as before intimated, but it may be or a single cylinderlsingle acting type, or a multiple cylinder type, either single ordouble acting, thel `improvements being applicable to any of thesedifferent types with equal facility. The water box is formed or builtwith the upper portiorL -1- providing' a conibined water and air chamber"-2- in which the water is discharged, and a lower portion -lforming`the suction or inlet chamber S3- lnto the chamber -Qfthe water isdischarged alternately through two discharge valves -3- and -3- .in thefront and side oit the water box respectively. llelow the said chamber-2- is the cylinder 5 which. may or may not be of a removable type, lnthis cylinder the piston -6-- reciprocates, said cylinder 5 being forcedinto its position in the casting' and surrounded by space -7-. rllhespace 7 is closed at its top and communicates with the suction chamberat its bottom` thereby permitting;v air to be trapped therein whichprovides` a shock saace on the suction side of the pump. An inlet orsuction pipe -9- connects with an inlet opening' -10- in the lower sideoif the water box leading to the suction chamber i3-- by means ol' aunion -ll.-. A discharge or outlet pipe #-12- from the pump communicateswith the combined water and air chamber 2 through a union 13M whichconnects it with a discharge nozzle el-l extending' down on the interiorof said chamber -2- to a point approximately in line with the dischargevalves -3- and -3-. rl"he suction valves -15- and 15- in the end andside ot the water box respectively, control the outlet from the suctionchamber and it will be observed these valves lie below the cylinder -5-.-The end ot the Vater box has a detachable valve plate 16- held thereonby means of cap screws -17-- The said valve plate provides a chamber*iS-e into which the water is drawn through suction valve lon the backstroke oit the piston. The return stroke forces the water through thedischarge valve -3- into the water and air chamber -2-- Y 3* is mountedin the top of the end valve plate 4G- and it will be seen that upondetaching said valve plate both valves are readily accessible as well asthe piston -(3-- The piston consists of a head which screws on to theend or the piston rod -l9 and has the appearance ot a nut on the end yofsaid piston rod. A follower 20- screws on to the inne end ot the pistonhead 4,6- and between said headand follower -20- the cup leathersQ1-vare placed with an intervening' washer Q2- Upon the removal of theend valve plate i6- the valves 3* and --15d well as the piston becomereadily accessible as before stated and thus the piston head including''the leathers and the tollower may be readily removed in the hand andthe leathers replaced if necessary and the whole returned as a unit.This is an important accomplishment yin these pumps when considered fromthe users standpoint.v v

A valve-controlled air inlet pipe -28- is tapped into the upper portionot the end 'valve plate 16- and provides an air `conmunication with thewater and chamber -2- through valve -3-. The suction and dischargevalves -land 3f-4 re spectively, at theside oit the water box operatealternately with the suction and inlet valves -15- and -3- at the end asrequired by the double acting character of the pump. The suction anddischarge valves .l5- and -3- are inclosed by a valve T he dischargevalve llt through a lateral passage -25- in the wate'i1 box. The wateris drawn from the inlet or suction chamber 8` through the suction valve15 on the same stroke of the pis.- ton that opens discharge valve -3.From chamber 24- the water is forced by the piston through the dischargevalve -3- into chamber -2- on the same stroke of the piston that openssuction valve l5 as will be readily understood. The piston rod -19-passes through a stuiing box or gland. -26- and is connected to thedriving crank shaft -27- through a connecting rod 28- and crosshead-30-- The bearings Z9-of the crank shaft are in the sides of the crankcase and are close to the oil box, the arrangement being close andcompact with the result that the strain is entirely central and the pumpis enabled to operate smoothly and without noise more efficiently.

Having described my invention, I claim:

l. In a pump, a water box having a combined water and air chamber and asuction chamber, a. pump cylinder containing a piston and arrangedbetween lsaid combined water and air chamber and said suction chamberand surrounded by a chamber communicating with said suction chamber andconstituting a shock chamber, a discharge valve forming an inlet to thelower portion of said combined water and air chamber, and a suctionvalve forming an outlet for said suction chamber, a valve plate formingva closure for said valve and the pump cylinder, and a passage from thesuction valve to the discharge valve, and anoutlet pipe communicatingwith said combined water and air chamber.

2. In a pump, a water box having an inlet and exhaust, said box beingprovided with a gland at one end thereof, a cylinder mounted in saidbox, a piston mounted in said cylinder, a rod extending from said pistonand through said gland, a valve plate mounted on the side of said box,another valve plate mounted in the end of said box opposite said gland,said plates forming passageways between the inlet and exhaust and thecylinder, valves mounted in said passageways, whereby access may be hadto the valves and cylinder without disturbing the inlet, the exhaust andthe gland.

3. In a pump, a water box having an inlet and an exhaust, said box beingprovided with a gland at one end thereof, a cylinder mounted in saidbox, a piston rod extending through said gland and into said cylinder, apistcn head mounted on said rod and extending into said"cylinder, cupleathers mounted on said head, a follower mounted on said head andadapted to hold said cups on said head, a valve plate mounted on theside of said box, another valve plate mounted on the end of said boxopposite said gland, said plates forming passageways between the inletand exhaust and the cylinder, valves mounted in said passageways,whereby said lpiston may be removed from the cylinder without disturbingsaid rod and gland.

4. In a pump, a water box having a combined water and air chamberand asuction chamber, a pump cylinder containing a piston between saidcombined water and air chamber and suction chamber and surroundedby a.chamber communicating with the suction chamber and constituting a shockchamber, a discharge valve forming lan inlettothe lower portion of saidcombined water and air chamber, a suction valve forming an outlet'fromsaid suctionl chamber, a valve plate forming a closure for said valvesand the pump cylinder and a. passage from the suction valve to theVdischarge valve, the removal yof said plate enabling ready accesstosaid valves and cylinder, and an outlet pipe on the interior of saidcombined water and air chamber Awith the receiving endthereofsubstantially in alignment with the upper plane of the dischargevalve. i I y 5. In a pump, a water box having a coinbined water and airchamber in the upper vportion thereof and an inlet or suction chamber inthe lower portion thereof, a pump 'cylinder arranged between saidcombined water and air chamber and said suction chamber, saidlcylinderhaving a space surrounding it communicating with the suction chamber, asuction valve controlling the outlet from said suction chamber, saidsuction valve and the pumpgcylinderbeing exposed at the end of the waterbox, a valve plate y forming a closure for said pump cylinder andsuction valve and1being detachable from the water box, a discharge valvemounted in said valve plate and controlling the passage from the suctionvalve to the combined water and air chamber, and adischarge pipe in saidchamber extending from a plane approximately coinciding with fthe upperplane of said discharge valve.

6, In a pump having a single cylinder, a

water box having a combined water and air chamber in the upper portionthereof` and an outlet or suction chamber in the'lower portion thereof,a pump cylinder between said chambers surrounded by a chamber whichcommunicates with the upper portion of the suction chamber and forms ashock chamber, suction valves forming outlets from the lower portion ofthe suction chainber, said suction valves being below the saidshockchambers, discharge valves forming iio an inlet to said. combinedwater and air chamber, valve Jplates forming'elosures for said suctionvalves and thepninpieylinder and detachably connected with thel waterbox, and discharge. valves inofunted in said valve plates andcontrolling the passage from the suction valves to theA combined waterand air chamber. i

7. lne. single Cylinder pump, a water box having' a combined water andair chamber in the upper portion "thereof and an inlet orsuetionvehaniber in the lower portion thereof, a. pump cylinderVarranged between said chambers land having a space surround,- .ingi itserving as a 'pulsation or shock chamber7 a suction valve below saidpnlsation chamber and 'forming an outlet from the inlet or suctionchamber, a valve plate torming` a detachable closuregor said pumpcylinder and Asuction valve, said valve plat-e forming ay water passageat the end ot the waten box into which an end of said cylinder and thesuction valve projects, and ai' discharge valve mounted in said valveplate and controlling the discharge of uvater to the eombinedwater andair chamber. i

8. In a single Cylinder pump, a water box having' a combined water andair chamber in the upper poi-"tion thereof and an inlet or suctionchain-berlin the lower portion rthereot, a pump cylinder arrangedvbetween said chambers and having a space surrounding' it serving as ashock chamber, a suction valve below said shoeleehamber and fior-ming anoutlet `from the inlet or suction ehamberg a valve plate formingdetachable closure for said pump cylinder and suction valve, said va'heplate torjniing a water ypassage at the end ofthe water bei `int-o whichan end of lsia'ifd' cylinder` and the suction valve projeets,

ay discharge valve'i mounted in said valve plate and controlling' ythedischarge of water I l i y v l y to the combined water land air chamber7and an air ypipe mounted in said valve plate to admit air' to said.water and air chamber.

lend suction valve and the 'cylinder`r a valve plate forming' a closurefor the side suction valve, discharge valvesfmount'ed in the upperportions of said valve plates and communi- 'eating' withA the combinedwalter land air chamber, the said valve plates 'providing chambers onthe side and end respectively oi" the waterboxgthe chamber of the endvalve platecommunicating;'with one end ot vthe pump cylinder and theehamberiot the side valve yplate communicating with the other end ofsaid pump cylinder.

4 In testimony whereof I aix my signature.

AUGUSTINE J. POCOCK.

